Vulnerable section of code existed in Linux since version 2.6.26 (July 2008) to 3.13 inclusive. Despite the fact that the correction was made in early January 2014 (and included in Linux 3.14-RC1), the problem has been reported as a vulnerability only on Monday. The release of patches for popular distributions can be traced to the following pages: Fedora / RHEL, SuSE, Debian, Ubuntu.